Daniel a



(Model D. A. A. BUG K.

MAINSPRING BARREL FOR WATCHES.

No. 293,142. Patented Feb. 5, 1884.

I UNITED STATES PATENT OFFICES DANIEL A. A. BUCK, OF WATERBURY,CONNECTICUT, ASSIG-NOR TO THE \VATERBURY IVATCH COMPANY, OF SAME PLACE.

MAtNSPRING-BARREL FOR WATCHES.

SPECIFICATION forming part of Letters Patent No. 293,142,

Application filed July 521, 1883.

T0 aZZ whom it may concern Be it known that I, DANIEL A. A. BUCK, oflVaterbnry, in the county of New Haven, and in the State of Connecticut,have invented certain new and useful Improvements in Mainspring-Barrelsfor Watches; and I do hereby declare that the following is a full,clear, and exact description thereof, reference being had to theaccompanying drawings, making a part of this specification, in whichFigure 1 is a perspective view of my springbarrel and main wheelseparated from each other. Fig. 2 is a like view of the same combinedfor use. Fig. 3 is a plan view of a watchmovement eontaining said parts.Fig. 4 is a section of the same upon line :0 a; of Fig. 3.

Letters of like name and kind refer to like parts in each of thefigures.

The design of my invention is to prevent injury to the train of a watchfrom breakage of the mainspring; and to this end it consists, incombination with stem-winding mechanism, in a mainspring-barrel madeseparate from the mainwheel, jonrnaled upon the main wheel arbor, andprovided with peripheral teeth, whereby it may be rotated upon andaround said arbor to wind the mainspring, substantially as and for thepurpose hereinafter specified.

In the annexed drawings, A represents a spring-barrel, which haspreferably somewhat less than the usual depth, and is provided upon itsperiphery with gear-teeth a of ordinary form. Said barrel is journaledupon the arbor b of the main wheel B, and its open end is containedwithin a recess, 2), which is provided within the contiguous face ofsaid wheel, which latter acts as a cover for said barrel to confine thespring in place within the same,

dated February 5, 1884.

(Model) The parts described being placed in posiis provided forengagement with the teeth a of said barrel, and a windingpinion, C,caused to mesh with the same, when said pinion will. be revolved andsaid barrel rotated until said spring is wound, and its power, actingthrough the main wheel 13, will actuate the train in the usual manner.If, now, the mainspring should break and expand in the ordinary man neragainst the inner periphery of the barrel, no damage could result to anyportion of the train or to said barrel, for the reason that the latterwould then be disconnected and free to revolve upon the arbor 1) withoutinfluence upon contiguous parts.

Having thus fully set forth the nature and merits of my invention, whatI claim as new 1s In combination with stenrwinding mechanism, amainspring-barrel made separate from the main wheel, journaled upon themainwhcel arbor, and provided with peripheral teeth, whereby it may berotated upon and around said arbor to wind the mainspring, substantiallyas and for the purpose specified.

In testimony that I claim the foregoing I have hereunto set my hand this17th day of May, A. D. 1883.

GEo. E. TERRY, FRED L. TERRY.

